House Speaker Nancy Pelosi (D-CA) on Friday said President Trump is an “impostor” who “is in over his head” in the Oval Office. She said that was why Trump “attacked” former United States Ambassador to Ukraine Marie Yovanovitch on Twitter during her Congressional testimony.

“Why do you think he was tweeting about her?” CBS News’ Margaret Brennan asked.

“Because he knows — well, he made a mistake and he knows her strength. And he was trying to undermine it,” she replied with a smile. “Of course presidents appoint ambassadors, but people don’t insult people, especially when they’re giving testimony before the Congress of the United States. I think even his most ardent supporters have to honestly admit this is the wrong thing for the President to do.”

Brennan reminded Pelosi that the White House has said Trump’s tweets are his opinion, not a means of intimidation. Naturally, the Speaker disagreed with that assessment.

“What the president, and perhaps some at the White House have to know, is that the words of the president weigh a ton. They are very significant and he should not frivolously throw out insults, but that’s what he does,” Pelosi explained. “I think part of it is his own insecurity as an impostor. I think he knows full well that he’s in that office way over his head and so he has to diminish everyone else.”

Everywhere Marie Yovanovitch went turned bad. She started off in Somalia, how did that go? Then fast forward to Ukraine, where the new Ukrainian President spoke unfavorably about her in my second phone call with him. It is a U.S. President’s absolute right to appoint ambassadors.